An autosomal recessive inherited disorder characterized by choreoathetosis beginning in childhood, progressive
cerebellar ataxia;
telangiectasis of
conjunctiva and
skin;
dysarthria; B- and T-cell immunodeficiency, and RADIOSENSITIVITY to IONIZING
radiation. Affected individuals are prone to recurrent sinobronchopulmonary infections, lymphoreticular
neoplasms, and other malignancies.
serum alpha-fetoproteins are usually elevated. (Menkes, Textbook of
child neurology, 5th ed, p688) The gene for this disorder (ATM) encodes a
cell cycle checkpoint protein kinase and has been mapped to chromosome 11 (11q22-q23).